Yaskawa MP920 User's Manual Design - Manual (Page 206)

5.2 CPU Modules
5-11
5
„ MEMOBUS Ports
Using RS-232C, the CPU Module can communicate with other devices on the MEMOBUS
network through the MEMOBUS ports.
The following transmission devices can be connected to the MEMOBUS ports: Program-
ming Devices, i.e., computers with an RS-232C interface.
The MEMOBUS port connector is a D-sub 9-pin, female connector. Table 5.3 shows the lay-
out of the connector pins and the signal names.
Switch Setting Function Explanation
Memory clear Initializes the CPU Module.
Perform this operation when
starting the system.
Program run Runs the user program.
Normally, this setting is used
during system operation.
Program stop Stops the user program.
Local reset Resets only the CPU Module.
(Other Modules will not be
reset.)
Master reset Resets all Modules.
Table 5.3 MEMOBUS Port Layout and Signal Names
Pin Abbreviation Signal Name
1 FG Protective ground
2 TXD Transmitting data
3 RXD Receiving data
4 RTS Request to send
5 CTS Clear to send
6 DSR Data set ready
7 GND Signal ground
8 −
9 DTR Data terminal ready
PORT2
PORT1